Claudio Grassi defeated Rodrigo Antonio Grilli 6-4 5-7 7-5 in the Italy F4 round of 32 on clay. The upset overturned the form book — Rodrigo Antonio Grilli came in leading the head-to-head 1–0. Claudio Grassi claimed a first win over Rodrigo Antonio Grilli in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-10-30 | Mexico F20 | R16 | hard | Rodrigo Antonio Grilli | 7-6(4) 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.